Hermann reusch



(Nomadel.)

H. REUS-CHl 8v B. PREU. CASTING HARD METALOR GHILLBD'ROLLS. No. 492,874.Patented Mar. 7, 1893.

UNrTne 8TaTas Trios,

PATENT HERMANN REUSCH, OF SENBACH, AUSTRIA-HUNGARY, AND BERNHARDl PREU,OF GOERLlTZ, GERMANY.

CASTING HRD-IVIETAL OR CHILLED ROLLS.

SPECIFICATION forming part 0f Letters Patent No. 492,874, dated March 7,1893.

Application led February 19. 1891. Serial No. 382,126| (No model.)Patented in Belgium June 10, 1890, No. 90,851; in Switzerland August 1,1890,11'0. 2,590. and iu Austria-Hungary October 11,1890,No. 28,492andNo. 50,000.

To all whom it may concern: Y

Be it known that we, HERMANN REUSCH, mining-engineer, residing atSenbach, (Tyrol,) in Austria-Hungary, and BERNHARD PREU, engineer,residing at Goerlitz, (Silesieu) in Germany, subjects of the Emperor ofGermany, have invented certain new and useful Improvements in orRelating to theManufacture or Casting of Hard-Metal or Chilled Rolls,(for which we have obtained Letters Patent in Belgium, No. 90,851, datedJune 10, 1890; in Switzerland, (provisional,) N o. 2,590, dated August1, 1800, and in Austria-Hungary, No. 28,492 and No. 50,000, datedOctober 1l, 1890;) and We do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to lettersof reference marked thereon, Which form a part of this specication. n

This invention relates to the art of casting hard metal or chilledrolls.

The mode of casting hard rolls as heretofore practiced,by admitting themetal through one or more runners at the lower journal end of the mold,the latter being in a vertical po sition, and allowing the metal to risetherein to the dead-head portion, presents serious difliculties. As themetal ascends along the cold surfaces of the mold it cools gradually, sothat on reaching the dead-head portion thereof it will rapidly congeal,thereby imprisoning the gases and' even dross or impurities in the moreiiuid portion of the mass of metal, resulting in a product that is moreor less porous, especially about the upper journal. To avoid this ithasbeen the custom to extend the dead-head portion of the mold considerablyabove the upper journal in order to aord space for a greater mass ofmetal to collect above the said upper journal, but in this case theferrostatic pressure of the more fluid portion of the metal iscorrespondingly increased, and as the mold, when it becomes heatedexpands more or less, while on the contrary that portion of the metal incontact with the surfaces of the mold cools and contracts, a space isleft between the thin outer shell of congealed metal and the innersurfaces of the mold, which under the increased ferrostatic pressure isliable to be ruptured,

so that the cast roll willhave alongitudinally tissu red outer face, andis consequently worthless in most cases. This inner ferrostatic pressnre is further increased, especially when a harder and more contractiblemetal is used, by the imprisoned gases, owing to the rapid cooling ofthe dead-head,'pwhich renders their escape impossible. In casting verylarge and long rolls the outflow of the metal must, moreover, be verylong continued, by reason of the greater cooling action of the largermass of the mold, in order that the metal having passed through theentire length of the mold shall reach the upper dead-'head still heatedenough to remain fluid, untilno danger exists of the hard metal rollbecoming ssured. But a very long outiiow is costly and causes the moldto become too highly heated and expanded, and, finally, the metal pouredin becomes Welded to the under part of the mold, which renders both themold and the roll useless.

The object of this invention is to provide means whereby thesedifficulties are overcome, and for this purpose we arrange an ingate atthe lower end of the mold and a second ingate at the upper or dead-headportion of the mold, sopcausing the molten metal to flow into the moldat or near both ends and through said mold in one and the samedirection. We also provide means for abstracting the heat from the mold,and thereby preventingit from unduly expanding,such means conf sistingof atomizing or spraying devices for atomizing or spraying a coolingagent. and projecting the same in a finely divided or sprayed conditionupon the outer surfaces of the mold.

Figure 1 shows a vertical section of a roll mold for casting hard metalor chilled lrolls according to our invention, and Fig. 2 isa transversesection taken on line 1 -2 of Fig. 1.

As shown in Fig. 1, the in-gate a, is preferably located at a higherelevation than usual, said in-gate being connected with the mold at itslower end by a tangential passage or channel, u2, and at the upperdead-head portion, b, of the mold, A, we provide an outd gate, c, and asuitable runner, c', located accordingvto the dimensions of the roll,about twenty or thirty centimeters above the upper roll journal, throughwhich out-gate the partially cooled metal can flow until the metal inthe upper dead-head portion is of substantially the same temperature asthat within the mold. In practice We have found that the out-dow ofmetal `need not exceed the quantity of metal heretofore required to tillan extended upper dead-head portion of a mold.

At the upper or dead-head portion of the mold a second ill-gate, b', isarranged tangentially communicating therewith at a proper point. Afterthe mold has been iilled through the first in-gate, and the out-flowfinished, hot ,iron of a suitable hard quality is poured into thisin-gate, b', which hard iron then Hows through the out-gate until themetal runs off sufficiently hot and the upper journal has been entirelyfilled with hot iron. In this Way, the gases contained in the moltenmass as Well as any dross or scoria, can freely es` cape, the resultbeing a roll, the upper journal of which Will be of the sainehomogeneity as the body of the roll, while the fluid mass inclosed inthe outer partially cooled 0r congealed shell can freely rise during thegrady ual congelation and contraction, so that the ferrostatic pressureof the fluid mass will not be increased by any resistance to its upwardflow, while the congelation of the metal in. the dead-head portion ofthe mold may bev further retarded by the use of non-conduct-v ors ofheat, such as charcoal or charcoal dust,

or a similar material, so that a practically, uniform cooling of theentire roll will take place without tissuring or cracking.

In the casting of rolls, more especially of large or heavy rolls, inorder to prevent the expansion of the mold and the issuring of the rollas hereinbefore stated, we provide means tively rapd cooling of the moldwe provide atomizers or spraying devices, whereby finely divided oratomized Water is projected upon the mold, which water is immediatelyvaporized or converted into steam, whereby the heat is rapidly taken upand the mold cooled without danger to the attendants.

F, indicates the compressed air supply pipes that are provided withanumber of atomizing nozzles, f, and A the water supply pipes providedwith a corresponding number of ejector nozzles, a', into which extendthe atomizing nozzles, f. In Fig. 2 we have shown four atornizers orspraying devices disposed around the mold, and provided with such anumber of atomizing or spraying nozzles as to apply the atomized coolingagent over the entire surface of the mold intermediate of the jour nais.

Having thus described our invention, what we claimV as new, and desireto secure by Letters Patent, is

l. The mode of casting rolls, which consists in causing the molten metalto flow into the mold at or near both ends and through said mold in oneand the same direction, substantially as and for the purpose set forth.

2. The mode of casting rolls, which consists in causing the molten metalto flow tangentially into the mold at or near both ends and through saidmold in one and the samedirection, substantially asset forth.

3. The mode of casting rolls, which consists in causing the molten metalto flow into lthe mold at or near both ends and through said mold in oneand the same direction, and cooling the metal by projecting atomizedwater or Water in the form of mist onto the mold, substantially as andfor the purpose set forth.

4. A mold for casting rolls having a `lower and an upper ingate arrangedso as to cause the metal to flow tangentially into the mold, incombination with a spill gate at the upper end of the mold,substantially as and for the purpose set forth.

In testimony whereof We affix our signatures in presence of twowitnesses.

HERMANN REUsoH. BERNHARD PREU.

Witnesses as to the signature'of Mr. Reusch:

EMIL I-IENZEL, F. W. CATLIN. Witnesses as to the signatureof Mr. Preu:

J osEr` B. ZEDLvrrcH, PAUL DRUGKEMLLER.

